Adobe photoshop cs2 사용자 설명서
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ADOBE PHOTOSHOP CS2
User Guide
You can’t improve a lower-quality image by printing it at a high resolution. Changing the print resolution of an image
simply makes each pixel larger, which results in pixelation—output with large, coarse-looking pixels. Increasing the
print resolution of an image doesn’t add any pixel information to the image. You can make a low-resolution image
look its best by picking a print size that makes the most of the pixels it has.
simply makes each pixel larger, which results in pixelation—output with large, coarse-looking pixels. Increasing the
print resolution of an image doesn’t add any pixel information to the image. You can make a low-resolution image
look its best by picking a print size that makes the most of the pixels it has.
Important: Video files are displayed only at 72 ppi. Even if an image has a higher resolution than 72 ppi, the quality may
not be very good when it’s displayed in a video-editing application.
not be very good when it’s displayed in a video-editing application.
A
B
C
Printing the same low-resolution image at different sizes
A. Small print size B. Medium print size C. Large print size
A. Small print size B. Medium print size C. Large print size
File size
The file size of an image is the digital size of the image file, measured in kilobytes (K), megabytes (MB), or gigabytes
(GB). File size is proportional to the pixel dimensions of the image. Images with more pixels may produce more detail
at a given printed size, but they require more disk space to store and may be slower to edit and print. Image resolution
thus becomes a compromise between image quality (capturing all the data you need) and file size.
(GB). File size is proportional to the pixel dimensions of the image. Images with more pixels may produce more detail
at a given printed size, but they require more disk space to store and may be slower to edit and print. Image resolution
thus becomes a compromise between image quality (capturing all the data you need) and file size.
Another factor that affects file size is file format. Because of the varying compression methods used by GIF, JPEG,
and PNG file formats, file sizes can vary considerably for the same pixel dimensions. Similarly, color bit-depth and
the number of layers and channels in an image affect file size.
and PNG file formats, file sizes can vary considerably for the same pixel dimensions. Similarly, color bit-depth and
the number of layers and channels in an image affect file size.
Photoshop supports a maximum pixel dimension of 300,000 by 300,000 pixels per image. This restriction places
limits on the print size and resolution available to an image.
limits on the print size and resolution available to an image.
Monitor resolution
Image data is translated directly into monitor pixels. This means that when the image resolution is higher than the
monitor resolution, the image appears larger on-screen than its specified print dimensions.
monitor resolution, the image appears larger on-screen than its specified print dimensions.
Monitor resolution depends on the size of the monitor plus its pixel setting. For example, a large image (800-by-600-
pixel dimension) shown on a 15-inch monitor would almost fill the screen, but on a larger monitor, the same image
would take up less room on the screen, and each pixel would appear larger.
pixel dimension) shown on a 15-inch monitor would almost fill the screen, but on a larger monitor, the same image
would take up less room on the screen, and each pixel would appear larger.